temp = int(input())
if temp >= 30:
  print("Yes")
else:
  print("No") temp = int(input()) temp int(input()) int input() input if temp >= 30:
  print("Yes")
else:
  print("No") temp >= 30 temp 30 print("Yes") print "Yes" print("No") print "No" temp = int(input()) int(input()) temp
temp = int(input())
if temp >= 30:
  print("Yes")
else:
  print("No")